Automatic rotary heating furnace



Nov. 20,1923. 7 fl G. BLUEMEL "AUTOMATIC ROTARY HEATING FURNACE Filed'Au'g. 22. 1921 2 Sheets-Sheet l Nov.

G. BLUEMEL AUTOMATIC ROTARY I IEATING FURNACE Filed Aug. 22, 1921 2 Sheets-Sheet 2 as shownin Patented Nov. 20, .1923.

[UNITED STATES GUSTAYE mom ts 'ro Eno; 01110.

""AUro a'ric norAnY HEA'ILNQ runnncn,

Application filed August 22, 1921. Serial 1T0, 494,203,

easily operated by oneman under satisfactory working conditions and in which the brickwork is easily accessible for repairs so that the furnace can be easily maintained at little expense for upkeep.

A further object of the invention is to provide a maximum radiating surface in a ompact rotary furnace, and to cause the furnace gases to travel along the surface of the material to be heated in a manner to secure the highest efliciency in the treatment of a large quantity of material.

The invention "has other ob'ects in view which will appear'hereafter in the detail description of afselec'ted embodiment thereof the accompanying drawings, in whi,ch

"Fig. 1 is a front elevation of the furnace; Fig.2 is a sectional view on the line '22 of F Fig. 3 is a sectional view on the line varying in. size and in number Fig. 4 is a sectional view showing an other brickwork arrangement.

- Referring to the drawlngs, the outer casing of thefurnace is madeup of a plurality tended across one end at 7 with a centrally. Y disposed opening 8 for the burner 9 whlCh is I work can be constructed to support two eta;

end of the furnace, the front end, has a large opening 12 which is covered by adoor consisting of a metal frame-worklii' lined with fire brick 14, This door is provided with rollers 15 which ride' onthe "circularouter edge 16 of the casing and thedoor is held rigidly in place cov'ering'tlie' openend of the furnace by rods connected therwith and with the main frame18. The (1001 is thus hun flush'against the front ofthe' furnace an opening 19 through which the material to be heated an be inserted from the furnace. e

A solid partition wall 20 of fire brick is with openings 22 adapted to receive and'hold V slabs and material of similar'shape, and it Y will be readily understood that these openings maybe varied in shape and size to ac- In FigL L I have shown how the brick- V centric circles of roundopenings to. ac commodate round stock 24 and if the stock is of sufficient length to require it there may be two partition walls 25, 25 instead of the single partition wall 20 preyiously' described. The casing is supported at the bottom by rolls 26 mounted on themain frame", and is .held'in positio byslide stile arena was roll 28 sprocketchain 29 is trained 1 around the furnace and a sprocket wheel 30 mounted on drive shaft "31 journaled int bearings on the main frame. This {drive shaft also carries a sprocket wheel32 and a sprocket chain 33 trained over this sprocket wheel and over a sprocket wheel 34;

it is provided with a small into or withdrawn cent-rally disposedwithin the heating chain e0 commo'date material of other shapesandf slzes. f I

suitably supported adjacent the casing. The onthe shaft 35' wliiclrcarries the'ratchet i bricked end of the furnace iscovered or supported with a suitable cover plate or frame 10 provided with'an opening 11 to register wlth the opening 8 and accommodate the burner. Any burner suitable for he .purpe e ay be mploye but on ywheel 136. A. ratchet pawl37 is held by a springf 38 in engagement the ratchet wheel and is carried by a bell crank 39 rwhich connectedby a rod 10 with an eccentricpin llcnthe shaft 42 which is driven by anysuitable connections with a motor {1;3 or other source of -powe r, 1 It is apparent at se -na es b f mvid d te e ret onirem mo or-sp ed td f rna ece a which, in the embodiment illustrated, is

about one revolution in fifteen minutes. This reduction may be accomplished by any suitable means whereby a proper rotation of the furnace casing is produced.

The furnace gases travel through the openings in the partition of Figs. 1 to 3 and thence escape through the circularly disposed flues 4A; and in Fig. at the furnace gases travel from the centrally disposed heating chamber 45 in opposite directions through the openings 23 and escape through the circularly disposed fines-4L6.

The operation of the furnace Will be apparent to those skilled in the art and it will be at once observed that the furnace can be operated by one man whose attention will be almost wholly directed to insertingthe material into the furnace and withdrawing it therefrom after it has completed the cycle of operation since only one burner is used and very little regulation thereof is required. The furnace will work under any desired temperature and can therefore be used for heat treating as well as for forging work. It is well known that successful heating requires a radiating surface of sufficient area, a heating chamber of sufficient sizeto receive the combustible gases and a-predetermined path for the furnace gases to secure the desired heating effect. My imp-rovedfurnace provides alarge area of radiating surface in a compact space and the gases are compelled to travel along the surface of the material to be heated in a predetermined pathso that the most eiiicient resu-lts are obtained. The construction is such that only the spent gases are allowed to escape after they have imparted their heat to the walls of theheating chamber and the ma terial to be heated, and the circular construction reduces the radiation lossesto a minimum. v

V I claim:

1. A rotary furnace comprising a circular casing and a heating chamber enclosed therein, a fire brick wall disposed across said heating chamber and provided with open-. ings therein to receive and support the material to be heated and to permit the passage of gases therethrough from one side of said wall to the other along the surfaceof the material, and means for revolving the casing.

2. A rotary furnace comprising a circular casing and a heating chamber enclosed therein, a partition wall across said chamber having a plurality ofopen'ings arranged in a circular series therethrough to receive and support the'material to be heated and to permit the passage of gases therethrough from one side of said wall to the other along the surface of the material, and means for revolving the casing. V v 1 3. A rotary furnace comprising a circular casing and a heating chamber enclosed therein, a plurality of walls extending across said chamber and havingopenings therethrough to receive and support the material to be treated and to permit the passage of V gases therethrough along the surface of the material to be heated, and means'for revolving the casing.

4. A rotary furnace comprising a circular casing and a heating chamber enclosed therein, a plurality of walls extending across: the chamber spaced apart and provided with a plurality of registered openings to receive and support thematerial to be heated and to permit the passage of gases therethrough along the surface ofthe material, and means for revolving the furnace.

5. A rotary furnace comprising a circular casing and a heating chamber enclosed therein, a plurality of walls across the cham her and provided with a plurality of registered opefilngs arranged in a circular series to receive and support the material to be heated and permit the passage of gases therethrough along the surface of the material, and means for revolving the casing.

6. A rotary furnace comprising a circu lar casing and a heating chamber enclosed therein having a peripherally disposed flue adjacent one end thereof, a wall ex tending across the chamber and provided with a plurality of openings therein ar ranged in a circular series adjacent the outer wall of the chamber to-receive and support the material to be heated and to permit the passage of gases therethrough along the surface of the material, and means for revolving the casing.

7. A rotary furnace comprising a circu- 1 lar casing, a brickwork lining for the outerwall and the rear end and a closure for the other end of the casing enclosing a heating chamber, a burner supported in adjacent relation to the casing, said rear end ofthe casin havin an o enin re isterin with .for the front end of the casing, and means engaged by the casing for supporting the closure. V

9. A rotary furnace comprising a circular casing having a heating chamber there'- in and open at its front end, means for revolving the casing, and a relatively stationary closure supported on the casing at the front end thereof,

10. A rotary furnace comprisinga circu V 7' lar casing having a heating chamber therein and open at its front end, means for reccular casing having -a heating chamber therein and open at its front end, means for revolving the casing, a relatively stationary closure hung on the casing at the front end thereof, rollers on said closure engaging the casing, and means for holding said closure in fixed position flush against the front end of the casing.

l3. A rotary furnace comprising a frame,

supporting and guiding rollers mounted in the frame, a circular casing enclosing the heating chamber and open at one end and arranged to travel on said rollers, means for revolving the'casing, a closure for the open end of the furnace, and means engaged by the casing for holding the closure 'in' stationary position While the casing revol'ves.

14. A rotary furnace comprising a frame,

supporting and guiding rollers mounted in the frame, a casing arranged to travel on said rollers and enclosing a heating chamber, an endless driving member around said casing, and pawl and ratchet means for drivin said member to revolve the casing.

15. rotary furnace comprising a frame, a circular casing enclosing a heating chamber and mounted to revolve in the frame, a driving shaft, driving connections between the driving shaft and the casing to revolve the casing, and means for driving said shaft in a step by step manner.

16. A rotary furnacecomprising a heating chamber, an apertured fire brick Wall disposed across said heating'chamber to receive and support the material to be heated, and means for revolving the chamber.

' GUSTAVE BLUEMEL. 

